SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1937f9bd05d2733384eba12f86a143b23f6b31bcfbfc5d1ee859f493877c83de' 
  AND token = '8LGCBvBFPqkITADLrVD6m5L8mJnt6MWQc2CKB90SB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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