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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20163b519e552d95dc261494959fbef272b5964ed7dff730ec6756d06b67c0a9' 
  AND token = '2Fdi0B6M7zzQuLBnTN7o/uLZoeMfXEF4o6K+nOwUVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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