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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd87cc7276ff060422f8cd15ad23f6acd1723ae14895ff12cbb63ee66e8929f2c' 
  AND token = 'L/jlZ9+yfQM5skvcuRTFbEt+mdUOp65UCLKkp9TOIwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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