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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a8ed3a1ad9581a181fa741d03a9020095336a09582dac89960e443ba52d07e2' 
  AND token = '67xKzZiKAPhFaKiKTa9wJge780IuiZxaZO6PuJX3+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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