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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27929306bd85df02984a03adf0d54f4bb907124857a27e5e96aa05cc1c289fd3' 
  AND token = 'V5bQn06e+hD7BXXRGcBs2p8raCnYCgJc6H1hYW3ncM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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