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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5196c9932057d5946eb8a94edb5a633ffe1da5928f753f75668f182ef7355148' 
  AND token = 'vAA5oYVQemmZb1YhFjiFE1No07yoVeKWuqbmu8L7eiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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