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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37098a13746f12f135c5c3320cdde0a628d0d8b61a777dc11b83bdc11ef35cb0' 
  AND token = 'zTrmAP2cwQSbFZyhebLzBWHFik4zKfpBWpaYj4XzNOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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