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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e26df6a3f510299fb506a12ce473682b1c5531cbc00770a89d9f5aba8df0efd' 
  AND token = 'kq3clLuEILFC2dEdom3BnN7ZOL30U+PYSdw7S40uUUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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