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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63c0a34b01c1f24c305c8431d91d93983dac7d9dbfb5fdb80939ae1dbe3a56ad' 
  AND token = 'WbYbp6wkZa1UobmvNvJEd7kqv8EpNMRZSN0o8orHYQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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