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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec9ea1b3001fe9576991ea7b6748290b9ae4d7cfeb5a757f66ace694ec7ad627' 
  AND token = 'Z9BlT3OOhofjwZyZsE8Y9p7Sa2wMpCiJ5sGd0tu40zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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