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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f73c04b35a9809ff348d1fadfcaf33f4401fc24dc5afa40ca5d19cf72cd731b8' 
  AND token = '1gY3awb/QY6xmEZU9bjMIHx0CHGTWZF5TrRHGXczuEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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