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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e2f42374eec15cc158f53eaac34df23c582ed0ad701507b5e84a176864646de' 
  AND token = 'USg1MxhOJzkHwzUsoeG6pC0IkvElvijinrsXcaYOndc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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