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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47446a430b6f3999f20ccfa30612415801bc3e8c99b393cb82859626cae866fe' 
  AND token = 'Ia8J5Q5TyU8/+A2TwtF0iR8tlyTburNFM51XCShpi0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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