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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00ec2f194cec6fd9a551e2bdb1756bba8ad70e0bb1b66c193a3674bf93c9ca60' 
  AND token = 'WvQgP6op5osXbxE2xd0IoE6ONLXrPj2aCjYfXhqHkcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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