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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a0397b980612d21bdcae4e14c4e83b5e596a81d3fa62b643cb57c13824bb382' 
  AND token = 'wnA8NjhFeCI5j7r+S40pC/6MAEDiK7keRY5uHf4F8/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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