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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd438415fbc30375221b85c1ddc72c49a116ba57745fc69586ca2955442aa06d0' 
  AND token = 'cs7pmpCwqy2lnNs5v9cAuZunNy37iVtOnXVIadNRuuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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