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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'becb65e8c3a885c59a9aff1f2399581b46c3be0929a63b829ab91df67a3ffd53' 
  AND token = '039HmfwwEYW8Iq4OIZtRBAT3MxtCeb9z9q3pGsFC1YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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