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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea17028e30425a815014e378308f5fb350d92ba70fd84565031d7141f634be98' 
  AND token = '61CbuXKaj1PI9OmIwLEw2eeubpb44BTyRHLrkjqDPDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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