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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5e95f6c93cb68de5f6a1a6e3fb98bf2ec45cec1c81ecd870288194c1f56d6d' 
  AND token = 'LGL1kse+C0rHQrQRxdplkdmf8rsNB7R6fA8m44DIs1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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