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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '642a70363bcd43fdb0b372f0fb2123c49693dddaca807e3ca94dabcd6bdeb76b' 
  AND token = 'nnl+vFy1uV+eyOFQVBPuW2rq5FqFjjP9U08M3fYXf6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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