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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad829ad860eb63d6b2a124e273ebf92d5e89939f7c3d0594a7aa598959a62c95' 
  AND token = '/oqc0CwZ05iFQus64VntiB5qtgnCwRSvdrkC0cEA7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}