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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a8b0c78e89c9f0c0cd7c4414cce8c5bb3924f8488630a3ce72dd4af18ec50fc' 
  AND token = 'Ksd74hFrH5Dx5WzRZuTBbe9MXOHZovWMLjIZbPVyqyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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