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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fbcc34477a5bf453184a3623515bccfaadfa3a9c6c6da3c892f965cdf25ab6e' 
  AND token = 'KQSw8TkHG4XNBSg8ZyDpITnHbw6sIcjH9xAGd1CNTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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