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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e2e0a5a92d96b22360c72dd8e61b631f4d27538342b87f1515831370f8c0135' 
  AND token = 'ZAEyTWgFwJ0fP8UcXRgep/8OSDR4FjxDsiCEAxJsPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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