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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d30e2d20022651aa5b56c28db83515e44e7fb9b69d47932733b0dad45050bf' 
  AND token = 't9sdzU4z0Z8fb3x15hvYnE223AsH1U7t2hYb08TJomE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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