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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4c2a2dc18f5c57452bd5c3c8a51970c145db92432a428a49fa6a364bdcac040' 
  AND token = '5Ke6do8QCC8QiAqEotKYem1pZ21BIjVx1nhW9CgY1mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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