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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '260ae90aedf37d80070d8a5841157a2f31aed242f9241e600002d98def902212' 
  AND token = 'B2Y0plyyqQbTmnnvHn2ZZNs+Z+bogYfE5rbxcvSQs0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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