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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4af53366ed7848dda89d13c75b58b805f3c579be2a3d349d3673db059241f175' 
  AND token = 'usNjqHLqiptpsk8GPOz53Mo0LU2G6kA3kTUXjxkCjOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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