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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40cc264f21355ea6f9991bbaa67165de1e68f8c748b01f94a14164ca15e9b0b4' 
  AND token = 'VNoKnZA6yr5mGzw9fqIT+6ItpfaQssPl1OfV/Eb0ebA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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