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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db5104f34a34f90d4245eaedbced74b1f83432e58dee7174897b9fea21b506bf' 
  AND token = 'AtAympOG/SKjbOuCrcU1xCvr+aLmA8Z93oVCboj283I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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