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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adbdb2d25340e99fba5dbbca9bcf8a6f4502920f24c1b0f2e1f3e6ed8544c438' 
  AND token = 'K9A7VY8tAoYMyP/h2RSJsnzi5oM2p4y71I+KGdxvTS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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