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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da590c1309bdbcd5b8d3e1e70e9dc1415a4692d99c05c5aeefbd67374c19aad3' 
  AND token = 'Yx+FbFqAOzHOdHWTQXBKI5NlbMac77Fx9ta6Gcuzcy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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