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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa56316a8d7d1ceb22cd1232e2ca09bf427e70bc4d81f33b982fa79dd740dd1' 
  AND token = 'nqfb3SDtJqsY1dWYuaV33adNnlYYocxY5agkppw5LOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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