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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08594ec46f8a5546045ee0adc156def30ec8a1622ffc3fe07581e8b45f43a562' 
  AND token = '+HoGA7VRWzBY3hfqUACJ8VnWx5EMnPciielsB1UhdF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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