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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ed71f517dd4fbaae694454a0f0d11d2e3f73a040c7b19271ce7ee4d60953fa4' 
  AND token = 'LmDlJwkQvytUFOl8u+h7UcZwK450+uR9+kTaP3P/Ga8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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