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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532cf0b3a2be6ad8a8c448fb579d64bc1c3db2fdba2fb3030acffc145c8630f0' 
  AND token = 'PaHrMUN96JQp7avf2ZynI2rHuAdNfRp/92CNlh+9EHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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