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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e10231bb4f87d5c05c333f1d17b8f6cd5d9835602ddd02dd32d37b2130b9cc9' 
  AND token = 'fK0Pzs0q1d79OlBaYdohstHgRxUAmeFQ/ufEcMeRbko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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