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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2b0c9adb2e2d3cfb96fa89564cf02d9e2a2691c2f458ff2e00461ecaa0f8ec0' 
  AND token = 'ArPLjuSTAaHZ2uvSZNsLgazDM0C/8rLsSNhTl/42SuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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