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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9796e9ac46bb6d1742cd77225c1d88e5aaf1ee533d1b40ff3d350adee74958cb' 
  AND token = 'UdGJldm5ZT0wiyfXX1QSJQxzCbnPjINl0CRlehvveD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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