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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7a230fe6774b6d409d9b98c337db5698d0b3c479c64523fff020a48fd6e7274' 
  AND token = 'EgdDl2oAZ+g33IB1y9gpWJ6cFDaWACZfk9Q5D6A8fAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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