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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '475fdd5df84b9207a983bed87ef23beec0d915b11abd7d1d9952afae53063f77' 
  AND token = 'mPhaXy1YN/weDN2HKTeRDZ79DxLHRFx4nL8nDgX9CZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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