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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3220b64ca5cd3a2bb62d70b696a03c56891bb67a70d43510d43081912d475ca1' 
  AND token = 'gWoS7Xm2QN3pR1JOfQz32U6xjix6d5Yzh+be+gsQ7hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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