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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '169c411652e4412cd38504b3f661643f4c23b4aa6c4986632053489b224b8ac2' 
  AND token = '9IkvBNHqVKFaIQgU1Qz+qyT5y05R5rFV7H0uNLTZAR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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