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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '706708f52725ac701c262b8b94d8aecdcb03dee8cb6aa718b84878f6e906f55b' 
  AND token = 'Ox0gbN8bn6oypGqTmsrUZl2uE6Kdt//xdLevmYM3kTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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