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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb727f5f211bf0d35fd5f1b2acd7d2e20aaa27d2e081ee2b86ca57979dc72a06' 
  AND token = 'DwvZfYhrFBIY1pn8yE/oYdlXGz+tTexaxbrVc52BNB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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