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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7786a90419420fee97aa6576a9b00915b8e305ce95f858312460a0a94f1abb6e' 
  AND token = 'jH5QsflDyVvDuuW7Ao8IStliOz8iBrZ1AmeWwFYlZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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