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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cace49f4a7a13432fde33691186af37562c6c9f738e7c3a9b17440c851488016' 
  AND token = 'JcQpRJ+GqlYMn3Y+l6JdiPW0IOLTpk1/r6fbrbxIT8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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