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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7937272b99e9ad9962478ef7f251e6f4797d1333068738cd67c2172b945af0f5' 
  AND token = '6O8qBp1MMKYBkdD7tJL7c2mlVEMISWDqU67O8GUR5RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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