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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8431bbecddfa808f2f6f3c5967ddfccafada1c2cc6f41b9440c89d5c7cc2e89e' 
  AND token = 'cVRNfBxYROYj/JYJXYOeP6Lf5Gd1REIYRC9Vh6r4Juw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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