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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f516161a68d85613c0b9ccb323ccd897a25cd7234c5451e51ae18171dc8af236' 
  AND token = 'SzFmoco9aDj6nz3DGB5KlMSmsSeDBAVkVvoch+bF4x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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