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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a25e262c074c9adaaa0f9d3850239f80a4be91aabbaa62cad8ee4fed658d9609' 
  AND token = 'MmZEQM3gQpvwWFa4pFwCY6FbJB3pkVz4x9ULFK3DwIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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