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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ab6aba8035a6885bcc406f583f8460cdf109464b6dd7a491cc1d4b11eaf9c89' 
  AND token = '/9qFtU3RTX/gUUl+SUF/F0BoKjtQFNz5/f2/jOdfaJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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