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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0be220f1df05b54ce5011f1442bc828dbe74d90123c976222452efce3fc0d70' 
  AND token = 'Hs08lmUdhEAof9Eohb5S4wZNAR6BVToiTg2a6aH2oCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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