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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8e4ad7e1c854c519f548e7ead856682e58273b36461376388121eb1f72a383' 
  AND token = '+ZpbwlOG6vNBUAyDqkrO2rdkucFw3VWLyczfDT1cZwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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