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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e384da8b0970e90fbfb1bd8ca63d2cd007d983baf498992b0854cfbd9a4c2f5e' 
  AND token = '9+KJpkFBg8j40kxmksa8m/+1BoyTTKxcmh9hqWbUQaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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